"What?" asked Karen.
"Karen, I can't believe that you'd change me into a boy! Even for a JOKE! Change me back, now!"
"Jon, I ... you're not a ..." Karen said, stunned. In her confusion, Jon grabbed the rock from her and held it in his hand.
"Wait! Jon, don't wish for anything."
But it didn't help. Jon began to speak. "I wish I would become a girl."